<template>
  <div class="app-container">
    <div id="container" class="container" />
  </div>
</template>

<script>
export default {
  mounted() {
    const container = document.getElementById('container')
    const colors = ['#e74c3c', '#8e44ad', '#3498db', '#e67e22', '#2ecc71']
    const SQUARES = 500

    for (let i = 0; i < SQUARES; i++) {
      const square = document.createElement('div')
      square.classList.add('square')

      square.addEventListener('mouseover', () => setColor(square))

      square.addEventListener('mouseout', () => removeColor(square))

      container.appendChild(square)
    }

    function setColor(element) {
      const color = getRandomColor()
      element.style.background = color
      element.style.boxShadow = `0 0 2px ${color}, 0 0 10px ${color}`
    }

    function removeColor(element) {
      element.style.background = '#1d1d1d'
      element.style.boxShadow = '0 0 2px #000'
    }

    function getRandomColor() {
      return colors[Math.floor(Math.random() * colors.length)]
    }
  }
}
</script>

<style scoped>
* {
    box-sizing: border-box;
}

.app-container {
  background-color: #111;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  overflow: hidden;
  margin: 0;
}

.container {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  max-width: 400px;
}

.square {
box-sizing: border-box;
  background-color: #1d1d1d;
  box-shadow: 0 0 2px #000;
  height: 16px;
  width: 16px;
  margin: 2px;
  transition: 2s ease;
}

.square:hover {
  transition-duration: 0s;
}

</style>
